Split a data frame into pieces based on variable contained in that data frame
splitter_d(data, .variables = NULL, drop = TRUE)data frame
a quoted list of variables
drop unnused factor levels?
a list of data.frames, with attributes that record split details
This is the workhorse of the d*ply functions. Based on the variables
you supply, it breaks up a single data frame into a list of data frames,
each containing a single combination from the levels of the specified
variables.
This is basically a thin wrapper around split which
evaluates the variables in the context of the data, and includes enough
information to reconstruct the labelling of the data frame after
other operations.
. for quoting variables, split
Other splitter functions:
splitter_a()
plyr:::splitter_d(mtcars, .(cyl))
#> $`4`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
#> 2 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
#> 3 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
#> 4 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
#> 5 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
#> 6 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
#> 7 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
#> 8 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
#> 9 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
#> 10 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
#> 11 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
#>
#> $`6`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
#> 2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
#> 3 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
#> 4 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
#> 5 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
#> 6 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
#> 7 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
#>
#> $`8`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
#> 13 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
#> 14 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
#>
plyr:::splitter_d(mtcars, .(vs, am))
#> $`0.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
#>
#> $`0.1`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
#> 2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
#> 3 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
#> 4 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
#> 5 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
#> 6 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
#>
#> $`1.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
#> 2 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
#> 3 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
#> 4 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
#> 5 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
#> 6 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
#> 7 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
#>
#> $`1.1`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
#> 2 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
#> 3 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
#> 4 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
#> 5 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
#> 6 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
#> 7 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
#>
plyr:::splitter_d(mtcars, .(am, vs))
#> $`0.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2
#>
#> $`0.1`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
#> 2 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
#> 3 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2
#> 4 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2
#> 5 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4
#> 6 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4
#> 7 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1
#>
#> $`1.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
#> 2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
#> 3 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2
#> 4 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4
#> 5 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6
#> 6 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8
#>
#> $`1.1`
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
#> 2 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1
#> 3 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2
#> 4 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1
#> 5 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1
#> 6 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2
#> 7 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2
#>
mtcars$cyl2 <- factor(mtcars$cyl, levels = c(2, 4, 6, 8, 10))
plyr:::splitter_d(mtcars, .(cyl2), drop = TRUE)
#> $`4`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 4
#> 2 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 4
#> 3 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 4
#> 4 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 4
#> 5 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 4
#> 6 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 4
#> 7 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 4
#> 8 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 4
#> 9 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2 4
#> 10 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 4
#> 11 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 4
#>
#> $`6`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> 1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 6
#> 2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 6
#> 3 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 6
#> 4 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 6
#> 5 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 6
#> 6 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 6
#> 7 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6 6
#>
#> $`8`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 8
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 8
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 8
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 8
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 8
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 8
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 8
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 8
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 8
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 8
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 8
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 8
#> 13 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 8
#> 14 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8 8
#>
plyr:::splitter_d(mtcars, .(cyl2), drop = FALSE)
#> $`2`
#> [1] mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> <0 rows> (or 0-length row.names)
#>
#> $`4`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 4
#> 2 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 4
#> 3 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 4
#> 4 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 4
#> 5 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 4
#> 6 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 4
#> 7 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 4
#> 8 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 4
#> 9 26.0 4 120.3 91 4.43 2.140 16.70 0 1 5 2 4
#> 10 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 4
#> 11 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 4
#>
#> $`6`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> 1 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4 6
#> 2 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4 6
#> 3 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 6
#> 4 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 6
#> 5 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 6
#> 6 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 6
#> 7 19.7 6 145.0 175 3.62 2.770 15.50 0 1 5 6 6
#>
#> $`8`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 8
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 8
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 8
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 8
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 8
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 8
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 8
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 8
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 8
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 8
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 8
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 8
#> 13 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 8
#> 14 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8 8
#>
#> $`10`
#> [1] mpg cyl disp hp drat wt qsec vs am gear carb cyl2
#> <0 rows> (or 0-length row.names)
#>
mtcars$cyl3 <- ifelse(mtcars$vs == 1, NA, mtcars$cyl)
plyr:::splitter_d(mtcars, .(cyl3))
#> $`4`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 26 4 120.3 91 4.43 2.14 16.7 0 1 5 2 4 4
#>
#> $`6`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4 6 6
#> 2 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4 6 6
#> 3 19.7 6 145 175 3.62 2.770 15.50 0 1 5 6 6 6
#>
#> $`8`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 8 8
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 8 8
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 8 8
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 8 8
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 8 8
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 8 8
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 8 8
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 8 8
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 8 8
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 8 8
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 8 8
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 8 8
#> 13 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 8 8
#> 14 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8 8 8
#>
#> $`NA`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 4 NA
#> 2 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 6 NA
#> 3 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 6 NA
#> 4 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 4 NA
#> 5 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 4 NA
#> 6 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 6 NA
#> 7 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 6 NA
#> 8 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 4 NA
#> 9 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 4 NA
#> 10 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 4 NA
#> 11 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 4 NA
#> 12 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 4 NA
#> 13 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 4 NA
#> 14 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 4 NA
#>
plyr:::splitter_d(mtcars, .(cyl3, vs))
#> $`4.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 26 4 120.3 91 4.43 2.14 16.7 0 1 5 2 4 4
#>
#> $`6.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4 6 6
#> 2 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4 6 6
#> 3 19.7 6 145 175 3.62 2.770 15.50 0 1 5 6 6 6
#>
#> $`8.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 8 8
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 8 8
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 8 8
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 8 8
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 8 8
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 8 8
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 8 8
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 8 8
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 8 8
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 8 8
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 8 8
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 8 8
#> 13 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 8 8
#> 14 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8 8 8
#>
#> $NA.1
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 4 NA
#> 2 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 6 NA
#> 3 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 6 NA
#> 4 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 4 NA
#> 5 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 4 NA
#> 6 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 6 NA
#> 7 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 6 NA
#> 8 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 4 NA
#> 9 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 4 NA
#> 10 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 4 NA
#> 11 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 4 NA
#> 12 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 4 NA
#> 13 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 4 NA
#> 14 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 4 NA
#>
plyr:::splitter_d(mtcars, .(cyl3, vs), drop = FALSE)
#> $`4.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 26 4 120.3 91 4.43 2.14 16.7 0 1 5 2 4 4
#>
#> $`4.1`
#> [1] mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> <0 rows> (or 0-length row.names)
#>
#> $`6.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4 6 6
#> 2 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4 6 6
#> 3 19.7 6 145 175 3.62 2.770 15.50 0 1 5 6 6 6
#>
#> $`6.1`
#> [1] mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> <0 rows> (or 0-length row.names)
#>
#> $`8.0`
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2 8 8
#> 2 14.3 8 360.0 245 3.21 3.570 15.84 0 0 3 4 8 8
#> 3 16.4 8 275.8 180 3.07 4.070 17.40 0 0 3 3 8 8
#> 4 17.3 8 275.8 180 3.07 3.730 17.60 0 0 3 3 8 8
#> 5 15.2 8 275.8 180 3.07 3.780 18.00 0 0 3 3 8 8
#> 6 10.4 8 472.0 205 2.93 5.250 17.98 0 0 3 4 8 8
#> 7 10.4 8 460.0 215 3.00 5.424 17.82 0 0 3 4 8 8
#> 8 14.7 8 440.0 230 3.23 5.345 17.42 0 0 3 4 8 8
#> 9 15.5 8 318.0 150 2.76 3.520 16.87 0 0 3 2 8 8
#> 10 15.2 8 304.0 150 3.15 3.435 17.30 0 0 3 2 8 8
#> 11 13.3 8 350.0 245 3.73 3.840 15.41 0 0 3 4 8 8
#> 12 19.2 8 400.0 175 3.08 3.845 17.05 0 0 3 2 8 8
#> 13 15.8 8 351.0 264 4.22 3.170 14.50 0 1 5 4 8 8
#> 14 15.0 8 301.0 335 3.54 3.570 14.60 0 1 5 8 8 8
#>
#> $`8.1`
#> [1] mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> <0 rows> (or 0-length row.names)
#>
#> $<NA>
#> [1] mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> <0 rows> (or 0-length row.names)
#>
#> $<NA>
#> mpg cyl disp hp drat wt qsec vs am gear carb cyl2 cyl3
#> 1 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1 4 NA
#> 2 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1 6 NA
#> 3 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1 6 NA
#> 4 24.4 4 146.7 62 3.69 3.190 20.00 1 0 4 2 4 NA
#> 5 22.8 4 140.8 95 3.92 3.150 22.90 1 0 4 2 4 NA
#> 6 19.2 6 167.6 123 3.92 3.440 18.30 1 0 4 4 6 NA
#> 7 17.8 6 167.6 123 3.92 3.440 18.90 1 0 4 4 6 NA
#> 8 32.4 4 78.7 66 4.08 2.200 19.47 1 1 4 1 4 NA
#> 9 30.4 4 75.7 52 4.93 1.615 18.52 1 1 4 2 4 NA
#> 10 33.9 4 71.1 65 4.22 1.835 19.90 1 1 4 1 4 NA
#> 11 21.5 4 120.1 97 3.70 2.465 20.01 1 0 3 1 4 NA
#> 12 27.3 4 79.0 66 4.08 1.935 18.90 1 1 4 1 4 NA
#> 13 30.4 4 95.1 113 3.77 1.513 16.90 1 1 5 2 4 NA
#> 14 21.4 4 121.0 109 4.11 2.780 18.60 1 1 4 2 4 NA
#>